I 1111111111111111 11111 1111111111 11111 11111 1111111111 111111111111111 IIII IIII
`US009997962B2
`
`c12) United States Patent
`Bae et al.
`
`(IO) Patent No.:
`(45) Date of Patent:
`
`US 9,997,962 B2
`Jun.12,2018
`
`(54) RECEIVING ANTENNA AND WIRELESS
`POWER RECEIVING DEVICE INCLUDING
`THE SAME
`
`(58) Field of Classification Search
`CPC .. H01Q 7/06; H02J 50/20; H02J 50/27; H02J
`7/025
`
`(71) Applicant: LG INNOTEK CO., LTD., Seoul (KR)
`
`(Continued)
`
`(72)
`
`Inventors: Seok Bae, Seoul (KR); Donchul Choi,
`Seoul (KR); Soon Young Hyun, Seoul
`(KR)
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`(73) Assignee: LG INNOTEK CO., LTD., Seoul (KR)
`
`( *) Notice:
`
`Subject to any disclaimer, the term ofthis
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 206 days.
`
`5,940,362 A * 8/1999 Plonsky .
`
`9,362,776 B2 * 6/2016 Low .
`(Continued)
`
`G08B 13/2408
`369/273
`G04C 10/00
`
`FOREIGN PATENT DOCUMENTS
`
`(21) Appl. No.:
`
`14/901,426
`
`(22) PCT Filed:
`
`Jun. 16, 2014
`
`(86) PCT No.:
`
`PCT/KR2014/005258
`
`§ 371 (c)(l),
`(2) Date:
`
`Dec. 28, 2015
`
`(87) PCT Pub. No.: WO2014/208914
`
`PCT Pub. Date: Dec. 31, 2014
`
`(65)
`
`Prior Publication Data
`
`US 2016/0156103 Al
`
`Jun. 2, 2016
`
`CN
`CN
`
`7/2012
`102598168
`5/2013
`103094992
`(Continued)
`
`OTHER PUBLICATIONS
`
`European Search Report dated Jul. 12, 2016 issued in Application
`No. 14817626.6.
`
`(Continued)
`
`Primary Examiner - M'Baye Diao
`(74) Attorney, Agent, or Firm - Ked & Associates, LLP
`
`(30)
`
`Foreign Application Priority Data
`
`(57)
`
`ABSTRACT
`
`Jun. 27, 2013
`
`(KR) ........................ 10-2013-0074620
`
`(51)
`
`Int. Cl.
`H02J 7100
`H0JF 27142
`
`(2006.01)
`(2006.01)
`(Continued)
`
`(52) U.S. Cl.
`CPC ............... H02J 50170 (2016.02); H0JQ 7106
`(2013.01); H02J 71025 (2013.01); H02J 50/10
`(2016.02);
`
`A receiving antenna of a wireless power receiving device
`wirelessly charging electric power according to an embodi(cid:173)
`ment of the present invention includes a substrate, a soft
`magnetic layer stacked on the substrate, and a receiving coil
`configured to receive electromagnetic energy emitted from a
`wireless power transmission device, wound in parallel with
`a plane of the soft magnetic layer, and formed inside of the
`soft magnetic layer, and an insulating layer is formed
`between the soft magnetic layer and the receiving coil.
`
`(Continued)
`
`19 Claims, 7 Drawing Sheets
`
`100
`
`(
`
`Ex.1001
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`

`

`US 9,997,962 B2
`Page 2
`
`(51)
`
`(2016.01)
`(2016.01)
`(2006.01)
`(2016.01)
`(2016.01)
`(2016.01)
`(2006.01)
`
`Int. Cl.
`H02J 50170
`H02J 50/10
`HOJQ 7106
`H02J 7102
`H02J 50/20
`H02J 50127
`H04B 5100
`(52) U.S. Cl.
`CPC .............. H02J 50/20 (2016.02); H02J 50127
`(2016.02); H04B 5/0037 (2013.01)
`( 58) Field of Classification Search
`USPC ........................................... 320/108; 307/104
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`9,504,194 B2 * 11/2016 Lee ......................... H0lF 38/14
`2005/0226136 Al* 10/2005 Moribe ............. GllB 11/10591
`369/275.4
`
`2009/0121677 Al
`2010/0007215 Al
`
`5/2009 Inoue et al.
`1/2010 Sakuma
`
`2010/0052992 Al
`2011/0050382 Al
`2013/0069444 Al *
`
`2013/0169399 Al*
`
`3/2010 Okamura et al.
`3/20 ll Baarman et al.
`3/2013 Waffenschmidt ....... H0lF 38/14
`307/104
`7/2013 Yoo ..................... H0lF 17/0013
`336/180
`
`FOREIGN PATENT DOCUMENTS
`
`EP
`JP
`JP
`KR
`KR
`KR
`TW
`WO
`
`2 096 7ll
`2007-503715 A
`2008-288370 A
`10-2010-0lll409 A
`10-20ll-124695 A
`10-2012-0057636 A
`2007-23596
`WO 2011/031473 A2
`
`9/2009
`2/2007
`11/2008
`10/2010
`11/20 ll
`6/2012
`6/2007
`3/20ll
`
`OTHER PUBLICATIONS
`
`International Search Report dated Sep. 18, 2014 issued in Applica(cid:173)
`tion No. PCT/KR2014/005258.
`Chinese Office Action dated Nov. 29, 2017 issued in Application
`No. 201480037192.1 (English translation attached).
`
`* cited by examiner
`
`Ex.1001
`APPLE INC. / Page 2 of 14
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`

`

`U.S. Patent
`
`Jun.12,2018
`
`Sheet 1 of 7
`
`US 9,997,962 B2
`
`FIG.1
`
`100
`\
`WIRELESS POWER
`TRANSMISSION DEVICE -
`
`200
`\
`WIRELESS POWER
`RECEIVING DEVICE
`
`-
`
`.
`
`300
`\
`- . EXTERNAL DEVICE
`
`FIG. 2
`
`100 (
`
`110
`
`120
`
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`

`

`U.S. Patent
`
`Jun.12,2018
`
`Sheet 2 of 7
`
`US 9,997,962 B2
`
`FIG. 3
`
`200
`
`(
`
`240
`
`FIG. 4
`
`430
`
`420
`
`230
`210
`
`220
`
`410
`
`400
`
`Ex.1001
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`

`

`U.S. Patent
`
`Jun.12,2018
`
`Sheet 3 of 7
`
`US 9,997,962 B2
`
`FIG. 5
`
`530
`
`520
`
`FIG. 6
`
`510
`
`/
`
`\ --- 510
`
`-'\ _ _, 500
`
`516
`
`514
`
`512
`
`Ex.1001
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`

`

`U.S. Patent
`
`Jun.12,2018
`
`Sheet 4 of 7
`
`US 9,997,962 B2
`
`FIG. 7
`
`SHEETS INCLUDING SOFT MAGNETIC METAL
`POWDER AND POLYMER RESIN ARE FABRICATED
`~
`PLURALITY OF SHEETS INCLUDING SOFT MAGNETIC
`METAL POWDER AND POLYMER RESIN ARE STACKED
`~
`ADHESIVE LAYER IS FORMED ON PLURALITY
`OF STACKED SHEETS
`~
`RECEIVING COIL IS DISPOSED ON ADHESIVE LAYER
`
`~
`PLURALITY OF SHEETS, ADHESIVE LAYER,
`AND RECEIVING COIL ARE SIMULTANEOUSLY
`COMPRESSED AT HIGH TEMPERATURE
`
`h----- 5700
`
`h----- 5710
`
`h----- 5720
`
`h----- 5730
`
`h----- 5740
`
`FIG. 8
`
`530
`
`520
`
`510
`
`500
`
`502
`
`Ex.1001
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`

`

`U.S. Patent
`
`Jun.12,2018
`
`Sheet 5 of 7
`
`US 9,997,962 B2
`
`H
`
`H
`
`H
`
`FIG. 9
`
`(a) COMPARATIVE EXAMPLE
`
`(b) EXAMPLE 1
`
`(c) EXAMPLE 2
`
`(d) EXAMPLE 3
`
`930
`
`910
`900
`
`930
`910
`920
`900
`
`930
`910
`920
`
`900
`
`930
`910
`
`920
`
`900
`
`Ex.1001
`APPLE INC. / Page 7 of 14
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`

`

`U.S. Patent
`
`Jun.12,2018
`
`Sheet 6 of 7
`
`US 9,997,962 B2
`
`FIG.10
`
`Ex.1001
`APPLE INC. / Page 8 of 14
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`

`

`U.S. Patent
`
`Jun.12,2018
`
`Sheet 7 of 7
`
`US 9,997,962 B2
`
`FIG. 11
`
`t":~·~L} C~()i>JD fT l()N f
`I
`1$0 •c
`,>(;,>-n~,-~n-~n-n-~ .-,-.;-,-., nrvnn n n~n:,,:-,-.;x
`I
`I
`/
`I
`I
`'
`' \
`l
`I
`l~) ............................. / ........................................... J ..... \···· ........................ .
`\
`I
`,,/
`,:
`,,·){, \,",-.§ {;"''<~
`...
`l
`i
`l
`.-l:..;:,.,> •~V \,>,,
`i
`l .. {~:l . ~~· ...................... ·.❖•..• • ••••.•••• :(.'N-.: ................ ,u.:.:u .: ... ..-.: .. ..-
`........................................ .:~ .....
`:
`/
`i
`I
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`.. I .... /
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`/....
`
`UJ
`
`:~> ; .AH f
`'"~
`:_ 1
`,·• '" ,,,,,-,. .. ",
`.. ,. ,: : ::.:;:,: ·1'' /
`4-<.> "'
`
`JX~ Kit/t~1s\;
`(!
`
`n
`
`J
`
`\
`
`1
`
`i
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`i
`I
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`
`:\,
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`I
`I
`"
`.... u ......... u,u.:.: ... ~ ........................ u.: ........................... ,
`\
`I
`
`\ .... !
`
`PFf:~:~:~tiF~f~
`t·_:.(}\H)t 'f)C}f<
`
`i
`.l
`,
`t
`:
`\
`,/
`:
`!
`:.··· ,/ ........... ······· 1 ···· ..................................... ·······,···· .......................... \··1
`l
`i
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`';_!
`t
`r!\tif'b Ftt1 f
`/ .. ................. ......................... .... T ............ .... ............
`.f
`~
`:
`/
`I
`
`Ex.1001
`APPLE INC. / Page 9 of 14
`
`

`

`US 9,997,962 B2
`
`1
`RECEIVING ANTENNA AND WIRELESS
`POWER RECEIVING DEVICE INCLUDING
`THE SAME
`
`CROSS-REFERENCE TO RELATED PATENT
`APPLICATIONS
`
`This application is a U.S. National Stage Application
`under 35 U.S.C. § 371 of PCT Application No. PCT/
`KR2014/005258, filed Jun. 16, 2014, which claims priority
`to Korean Patent Application No. 10-20130074620, filed
`Jun. 26, 2013, whose entire disclosures are hereby incorpo(cid:173)
`rated by reference.
`
`TECHNICAL FIELD
`
`The present invention relates to wireless charging, and
`more particularly, to a receiving antenna for wireless charg(cid:173)
`ing and a wireless power receiving device including the
`same.
`
`BACKGROUND ART
`
`5
`
`20
`
`2
`wirelessly charging electric power includes a substrate, and
`a soft magnetic layer stacked on the substrate, and a receiv(cid:173)
`ing coil wound in parallel with a plane of the soft magnetic
`layer and formed inside of the soft magnetic layer. An
`insulating layer is formed between the soft magnetic layer
`and the receiving coil.
`The receiving antenna may further include a first adhesive
`layer formed between the soft magnetic layer and the
`insulating layer, and a second adhesive layer formed
`10 between the insulating layer and the receiving coil.
`The insulating
`layer may include a poly ethylene
`terephthalate (PET) material.
`The soft magnetic layer may include a plurality of stacked
`15 sheets including a soft magnetic metal powder and a poly(cid:173)
`mer resm.
`The soft magnetic layer may include a groove portion.
`The receiving antenna may further include a support
`means stacked on the receiving coil.
`According to another embodiment of the present inven-
`tion, a method of fabricating a receiving antenna includes
`stacking a plurality of sheets including a soft magnetic metal
`powder and a polymer resin, forming an insulating layer on
`an upper plane of the plurality of sheets, disposing a
`25 receiving coil on the insulating layer, and compressing the
`plurality of sheets, the insulating layer, and the receiving coil
`to form the receiving coil inside of the plurality of sheets.
`According to still another embodiment of the present
`invention, a wireless power receiving device wirelessly
`30 charging electric power includes a substrate, a soft magnetic
`layer stacked on the substrate, a receiving coil wound in
`parallel with a plane of the soft magnetic layer, and formed
`inside of the soft magnetic layer, a circuit unit connected to
`35 the receiving coil, and converting electromagnetic energy
`into electrical energy, and a storage unit for storing the
`electrical energy. An insulating layer is formed between the
`soft magnetic layer and the receiving coil.
`
`According to the development of wireless communication
`technology, interest in wireless power transceiving technol(cid:173)
`ogy which provides electric power to electronic devices
`wirelessly is increasing. The wireless power transceiving
`technology may be diversely applied to a power supply for
`household electronic products and for electric cars or sub(cid:173)
`way trains, as well as battery charging of portable terminals.
`General wireless power transceiving technology uses a
`principle of magnetic induction or magnetic resonance. For
`example, when electrical energy is applied to a transmission
`antenna of a wireless power transmission device, the trans(cid:173)
`mission antenna may convert the electrical energy into
`electromagnetic energy and emit the electromagnetic energy
`to the surroundings. And a receiving antenna of a wireless
`power receiving device may receive the electromagnetic
`energy emitted from the transmission antenna and convert it
`to the electrical energy.
`In that case, it is necessary to minimize an energy loss
`between the wireless power transmission device and the
`wireless power receiving device to increase power trans(cid:173)
`ceiving efficiency. For this, the transmission antenna and the
`receiving antenna may need to be mutually arranged within 45
`an effective distance. Further, a soft magnetic material may
`be disposed around the transmission antenna and the receiv(cid:173)
`ing antenna to focus the electromagnetic energy emitted
`from the transmission antenna toward the receiving antenna.
`For this, a receiving coil is formed on a soft magnetic 50
`layer. In that case, an air layer is formed between the
`receiving coil and the soft magnetic layer, and therefore
`there may be a problem that guiding effect of a magnetic
`field of the soft magnetic layer is reduced.
`
`40
`
`Advantageous Effects
`
`According to embodiments of the present invention, the
`performance of electromagnetic energy focusing of a receiv(cid:173)
`ing antenna in a wireless power receiving device can be
`increased, and therefore wireless power transceiving effi(cid:173)
`ciency can be maximized. Particularly, an air layer between
`a receiving coil and a soft magnetic layer is removed, and
`therefore guiding effect of a magnetic field of the soft
`magnetic layer becomes high, and an improved power
`transmission efficiency can be obtained by decreasing a
`thickness of the receiving antenna and decreasing a distance
`between a transmission antenna and the receiving antenna.
`Accordingly, an electromagnetic energy focusing effect of
`a required standard even with a thin thickness can be
`55 obtained, and therefore the present invention can be applied
`to various electronic devices of the slinmess trend such as a
`TV, a portable terminal, a notebook, a tablet PC, etc.
`Further, the wireless power receiving device according to
`the embodiments of the present invention has an excellent
`60 electromagnetic energy focusing performance and can use
`inexpensive materials, and therefore, can be applied to a
`large application field such as electric cars, subway trains,
`etc.
`Further, the probability of an electrical short between the
`65 soft magnetic layer and the receiving coil is reduced, and
`therefore reliability of the receiving antenna may be
`improved.
`
`DISCLOSURE
`
`Technical Problem
`
`The present invention aims to provide a structure of a
`receiving antenna capable of improving a wireless power
`receiving efficiency of a wireless power receiving device.
`
`Technical Solution
`
`According to an embodiment of the present invention, a
`receiving antenna of a wireless power receiving device
`
`Ex.1001
`APPLE INC. / Page 10 of 14
`
`

`

`3
`BRIEF DESCRIPTION OF DRAWINGS
`
`US 9,997,962 B2
`
`10
`
`4
`inventive concept. Elements of the inventive concept
`referred to in the singular may number one or more, unless
`the context clearly indicates otherwise. It will be further
`understood that the terms "comprise", "have", etc. when
`5 used herein, specify the presence of stated features, num(cid:173)
`bers, steps, operations, elements, components, and/or groups
`thereof, but do not preclude the presence or addition of one
`or more other features, numbers, steps, operations, elements,
`components, and/or groups thereof.
`Unless otherwise defined, all terms (including technical
`and scientific terms) used herein are to be interpreted as is
`customary in the art to which this inventive concept belongs.
`It will be further understood that terms in common usage
`should also be interpreted as is customary in the relevant art
`15 and not in an idealized or overly formal sense unless
`expressly so defined herein.
`Hereinafter, example embodiments are described with
`reference to the attached drawings, and same or correspond(cid:173)
`ing elements regardless of drawing symbols will be given
`20 the same reference numbers, and overlapping descriptions
`will be omitted.
`FIG. 1 is a block diagram illustrating a wireless power
`transceiver system in accordance with an embodiment of the
`present invention.
`Referring to FIG. 1, the wireless power transceiver system
`may include a wireless power transmission device 100 and
`a wireless power receiving device 200. The wireless power
`transmission device 100 connected to a power supply
`applies electrical energy to a transmission antenna, and the
`30 transmission antenna converts the electrical energy into
`electromagnetic energy and emits the electromagnetic
`energy to the surroundings. The wireless power receiving
`device 200 receives the electromagnetic energy emitted
`from the transmission antenna using a receiving antenna,
`35 converts the electromagnetic energy into the electrical
`energy, and performs charging.
`Here, the wireless power transmission device 100 may be,
`for example, a transmission pad. Further, the wireless power
`receiving device 200 may be a part of a structure of a
`40 portable terminal, household/personal electronic products, a
`transportation means, etc to which wireless power transceiv(cid:173)
`ing technology is applied. The portable terminal, household/
`personal electronic products, a transportation means, etc. to
`which the wireless power transceiving technology is applied
`45 may be set to include only the wireless power receiving
`device 200, or to include both the wireless power transmis(cid:173)
`sion device 100 and the wireless power receiving device
`200.
`Here, the wireless power transmission device 100 may
`transmit electric power using an electromagnetic induction
`method or a resonance method. Similarly, the wireless
`power receiving device 200 may receive the electric power
`using the electromagnetic induction method or the resonance
`method.
`Meanwhile, the wireless power receiving device 200 may
`include a module which simultaneously has a wireless
`power conversion (WPC) function and a near field commu(cid:173)
`nication (NFC) function. Here, the wireless power receiving
`device 200 may perform NFC with an external device 300
`60 including an NFC module.
`FIG. 2 is a diagram illustrating a part of a wireless power
`transmission device, and FIG. 3 is a diagram illustrating a
`part of a wireless power receiving device.
`Referring to FIG. 2, the wireless power transmission
`65 device 100 may include a transmitting circuit (not shown),
`a soft magnetic core 110, a transmitting antenna 120, and a
`permanent magnet 130.
`
`FIG. 1 is a block diagram illustrating a wireless power
`transceiver system in accordance with an embodiment of the
`present invention.
`FIG. 2 is a diagram illustrating a part of a wireless power
`transmission device, and FIG. 3 is a diagram illustrating a
`part of a wireless power receiving device.
`FIG. 4 is a cross-sectional view illustrating a soft mag(cid:173)
`netic layer and a receiving coil.
`FIG. 5 is a cross-sectional view illustrating a soft mag(cid:173)
`netic layer and a receiving coil in accordance with an
`embodiment of the present invention.
`FIG. 6 is a cross-sectional view illustrating an adhesive
`layer in accordance with an embodiment of the present
`invention.
`FIG. 7 is a flowchart illustrating a method of embedding
`a receiving coil in a soft magnetic layer in accordance with
`an embodiment of the present invention.
`FIG. 8 is a cross-sectional view illustrating an example of
`disposing a receiving coil on an upper plane of a plurality of
`sheets and performing compression on the receiving coil
`after compressing the plurality of sheets at a high tempera(cid:173)
`ture.
`FIG. 9 is a cross-sectional view illustrating a soft mag- 25
`netic layer and a receiving coil in accordance with a com(cid:173)
`parative example and an example of the present invention.
`FIG. 10 is a graph illustrating a measurement result of a
`transmission efficiency in accordance with a comparative
`example and an example of the present invention.
`FIG. 11 is a graph illustrating a pressure condition and
`heat treatment condition in accordance with a embodiment
`of the present invention.
`
`MODE FOR INVENTION
`
`While the inventive concept is susceptible to various
`modifications and alternative forms, specific embodiments
`thereof are shown by way of example in the drawings and
`will herein be described in detail. It should be understood,
`however, that there is no intent to limit the inventive concept
`to the particular forms disclosed, but on the contrary, the
`inventive concept is to cover all modifications, equivalents,
`and alternatives falling within the spirit and scope of the
`inventive concept.
`It will be understood that, although the terms "first,"
`"second," etc. may be used herein to describe various
`components, these components should not be limited by
`these terms. These terms are only used to distinguish one
`component from another component. Thus, a first compo- 50
`nent discussed below could be termed a second component
`and the second component discussed below could be termed
`the first component without departing from the teachings of
`the present inventive concept. The "and/or" includes each
`and all combinations of one or more of the items mentioned. 55
`It will be understood that when an element is referred to
`as being "connected" or "coupled" to another element, it can
`be directly connected or coupled to the other element or
`intervening elements may be present. In contrast, when an
`element is referred to as being "directly connected" or
`"directly coupled" to another element, there are no inter(cid:173)
`vening elements. Other words used to describe relationships
`between elements should be interpreted in a like fashion
`(i.e., "between" versus "directly between," "adjacent" ver(cid:173)
`sus "directly adjacent," etc.).
`The terminology used herein to describe embodiments of
`the inventive concept is not intended to limit the scope of the
`
`Ex.1001
`APPLE INC. / Page 11 of 14
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`

`US 9,997,962 B2
`
`5
`The soft magnetic core 110 may include a soft magnetic
`material having a thickness of several mms. Further, the
`transmitting antenna 120 consists of a transmitting coil, and
`the permanent magnet 130 may be surrounded by the
`transmitting antenna 120. Here, the permanent magnet 130 5
`is not an essential element and may be omitted according to
`specifications.
`Referring to FIG. 3, the wireless power receiving device
`200 may include a receiving circuit (not shown), a soft
`magnetic layer 210, and a receiving coil 220. The soft 10
`magnetic layer 210 may be formed on a substrate (not
`shown). The substrate may include many layers of fixed
`sheets, and may be connected to the soft magnetic layer 210
`to fix the soft magnetic layer 210.
`The soft magnetic layer 210 focuses the electromagnetic
`energy emitted from the transmitting antenna 120 of the
`wireless power transmission device 100.
`The soft magnetic layer 210 may include a metallic
`material or a ferrite material, and may be implemented in 20
`various forms of a pellet, a plate, a ribbon, foil, a film, etc.
`In an example embodiment, the soft magnetic layer 210 may
`be a form in which a plurality of sheets including a single
`metal or an alloy powder having soft magnetism (hereinaf(cid:173)
`ter, referred to as a soft magnetic metallic powder) and a 25
`polymer resin are stacked. In another example embodiment,
`the soft magnetic layer 210 may be an alloy ribbon, a stacked
`ribbon, foil, or a film including at least one of Fe, Co, and
`Ni. In still another example embodiment, the soft magnetic
`layer 210 may be a composite including 90 wt% or more of 30
`FeSiCr flakes and 10 wt% or less of a polymer resin. In yet
`another example embodiment, the soft magnetic layer 210
`may be a sheet, a ribbon, foil, or a film including nickel-zinc
`(Ni-Zn) ferrite.
`The receiving coil 220 may be stacked on the soft 35
`magnetic layer 210. The receiving coil 220 may be wound
`in a direction parallel to a plane of the soft magnetic layer
`210 on the soft magnetic layer 210. For example, a receiving
`antenna applied to a smart phone may have a form of a spiral
`coil which has an outer diameter of no more than 50 mm and 40
`an inner diameter of 20 mm or greater. The receiving circuit
`converts the electromagnetic energy received through the
`receiving coil 220 into the electrical energy, and charges a
`battery (not shown) with the converted electrical energy.
`Although not shown, a heat dissipation layer may be 45
`further included between the soft magnetic layer 210 and the
`receiving coil 220. In this specification, the soft magnetic
`layer 210 and the receiving coil 220 together may be referred
`to as the receiving antenna.
`When the wireless power receiving device 200 simulta- 50
`neously has the WPC function and the NFC function, an
`NFC coil 230 may be further stacked on the soft magnetic
`layer 210. The NFC coil 230 may be formed to surround an
`outer portion of the receiving coil 220.
`Further, the receiving coil 220 and the NFC coil 230 may 55
`be electrically connected to each other through a terminal
`240.
`FIG. 4 is a cross-sectional view illustrating a soft mag(cid:173)
`netic layer and a receiving coil.
`Referring to FIG. 4, an adhesive layer 410 is formed on
`a soft magnetic layer 400, a receiving coil 420 is formed on
`the adhesive layer 410, and a support film 430 is formed on
`the receiving coil 420. The support film 430 supports the
`receiving coil 420, and may include a polyethylene
`terephthalate (PET) material.
`As described above, when the soft magnetic layer 400 and
`the receiving coil 420 is bonded through the adhesive layer
`
`6
`410, an air layer A is formed, and guiding effect of a
`magnetic field of the soft magnetic layer 400 may be
`reduced.
`According to embodiments of the present invention, an air
`layer in a receiving antenna of a wireless power receiving
`device is removed and power transmission efficiency is
`increased.
`FIG. 5 is a cross-sectional view illustrating a soft mag(cid:173)
`netic layer and a receiving coil in accordance with an
`embodiment of the present invention.
`Referring to FIG. 5, an adhesive layer 510 is formed on
`a soft magnetic layer 500, a receiving coil 520 is formed on
`the adhesive layer 510, and a support means 530 is formed
`15 on the receiving coil 520. The support means 530 supports
`the receiving coil 520, and may include a polyethylene
`terephthalate (PET) material, and may have a form of film.
`Here, the receiving coil 520 may be formed inside of the soft
`magnetic layer 500. For example, the receiving coil 520 may
`be embedded in an upper surface of the soft magnetic layer
`500. Accordingly, the air layer formed between the receiving
`coil 520 and the soft magnetic layer 500 is removed and
`power transmission efficiency can be increased.
`For this, the soft magnetic layer 500 includes a groove
`portion to accommodate the receiving coil 520 inside of the
`soft magnetic layer 500, and may bond the receiving coil
`520 in the groove portion using the adhesive layer 510.
`Further, after the receiving coil 520 is disposed on the
`upper surface of the soft magnetic layer 500, the receiving
`coil 520 may be embedded inside of the soft magnetic layer
`500 by compressing the soft magnetic layer 500 and the
`receiving coil 520. For facilitating compression and embed(cid:173)
`ment of the receiving coil 520, the soft magnetic layer 500
`may include sheets including a soft magnetic metal powder
`and a polymer resin. Specific methods will be described
`below.
`Meanwhile, the adhesive layer 510 may have a double(cid:173)
`sided structure including an insulating layer.
`FIG. 6 is a cross-sectional view illustrating an adhesive
`layer in accordance with an embodiment of the present
`invention.
`Referring to FIG. 6, the adhesive layer 510 may include
`a first adhesive layer 512, an insulating layer 514 formed the
`first adhesive layer 512, and a second adhesive layer 516
`formed on the insulating layer 514.
`Here, the insulating layer 514 may include, for example,
`a polyethylene terephthalate (PET) material. Therefore, even
`when the first adhesive layer 512 or the second adhesive
`layer 516 is broken down in the process of forming or
`embedding the receiving coil 520 inside of the soft magnetic
`layer 500, an electrical short between a metal in the soft
`magnetic layer 500 and the receiving coil 520 can be
`prevented.
`FIG. 7 is a flowchart illustrating a method of embedding
`a receiving coil in a soft magnetic layer in accordance with
`an embodiment of the present invention. Here, the soft
`magnetic layer is assumed to include sheets including a soft
`magnetic metal powder and a polymer resin.
`Referring to FIG. 7, sheets including a soft magnetic
`60 metal powder and a polymer resin are fabricated (S700). For
`this, sheets with a thin form may be fabricated by perform(cid:173)
`ing film casting on ink including a solvent, a soft magnetic
`metal powder and a polymer resin. Here, the soft magnetic
`metal powder may include, for example, an Fe-silicon-based
`65 alloy. Further, the polymer resin may include, for example,
`at least one of a rubber-based polymer resin, an epoxy-based
`polymer resin, and a silicon-based polymer resin.
`
`Ex.1001
`APPLE INC. / Page 12 of 14
`
`

`

`US 9,997,962 B2
`
`8
`Example 1 of FIG. 9B, to embed the receiving coil 920 in the
`magnetic sheet 900, one sheet of aluminum duo-foil with 1.2
`mmT, one sheet of a lower cover (FR-25DM), a structure of
`Comparative Example of FIG. 9A, one sheet of an upper
`cover (FR-250M), one sheet of aluminum foil with 1.2
`mmT, two sheets of PVC with 520 mm * 360 mm and 1.2
`mmT (for high temperature), two sheets of kraft with 530
`mm * 420 mm, one sheet of aluminum duo-foil with 1.2
`mmT are sequentially stacked, and then heat treatment and
`compression are performed according to conditions of FIG.
`11.
`Referring to Example 2 of FIG. 9C, a magnetic sheet 900
`having a thickness of 4.3 mm, an adhesive sheet 910 having
`a thickness of 0.03 mm, a receiving coil 920 having a
`thickness of0.13 mm, and a PI film 930 having a thickness
`of 0.03 mm are sequentially stacked, and the receiving coil
`920 is embedded in the magnetic sheet 900.
`Referring to Example 3 of FIG. 9D, a magnetic sheet 900
`having a thickness of 4 mm, an adhesive sheet 910 having
`a thickness of 0.03 mm, a receiving coil 920 having a
`thickness of0.16 mm, and a PI film 930 having a thickness
`of 0.03 mm are sequentially stacked, and the receiving coil
`920 is embedded in the magnetic sheet 900.
`FIG. 9B has a thickness of 0.56 mm, and is thinner than
`FIG. 9A having a thickness of 0.59 mm. Each of cross(cid:173)
`sections of FIG. 9C and FIG. 9D is 0.59 mm, and is
`fabricated with the same thickness as FIG. 9A.
`Referring to FIG. lOA which compares transmission
`efficiency of Comparative Example and Example 1, a sec(cid:173)
`tion showing high efficiency (Max % ) according to Example
`1 is broader compared with Comparative Example. Accord-
`ingly, it can be noted that the transmission efficiency of
`Example 1 is higher than that of Comparative Example.
`Referring to FIG. 10B which compares transmission
`efficiency of Comparative Example and Example 2, the
`transmission efficiency of Example 2 is similar to that of
`Comparative Example. However, in Example 2, the mag(cid:173)
`netic sheet is thick and therefore magnetic shielding effect
`may increase.
`Referring to FIG. lOC which compares transmission
`efficiency of Comparative Example and Example 3, it can be
`noted that the transmission efficiency of Example 3 is
`excellent compared with that of Comparative Example.
`Particularly, in Example 3, as a driving power becomes
`higher, a drop phenomenon of the transmission efficiency
`becomes decreased.
`This written description sets forth the best modes of the
`invention. It will be understood by those skilled in the art
`that various modifications can be made without departing
`50 from the scope of the present invention and without chang(cid:173)
`ing essential features.
`
`7
`Next, after a plurality of sheets are stacked (S710), then
`an adhesive layer is formed on an upper surface of the
`plurality of sheets (S720), a receiving coil is disposed on the
`adhesive layer (S730), and the plurality of sheets, the
`adhesive layer, and the receiving coil are simultaneously 5
`compressed at a high temperature (S740). Here, the com(cid:173)
`pression process may be performed for one to four hours at
`a temperature of 80 to 250° C. and at a pressure of 100 to
`300 kgf/cm2
`. Preferably, the compression process may be
`performed for two to three hours at a temperature of 150 to 10
`200° C. and at a pressure of 150 to 250 kgf/cm2
`.
`As described above, when the plurality of sheets and the
`receiving coil are simultaneously compressed, due to mobil-
`ity of the polymer resin included in the sheets, the groove
`portion is formed on a boundary surface between the sheets 15
`and the receiving coil, and the polymer resin permeates into
`a space between receiving coils and the air layer is not
`formed. Therefore, a problem of reducing of the guiding
`effect of a magnetic field due to the air layer between the
`receiving coil and the soft magnetic layer can be prevented. 20
`On the contrary, when the plurality of sheets and the
`receiving coil are not simultaneously compressed, but the
`plurality of sheets are first compressed at a high temperature
`and then the receiving coil is disposed on an upper surface
`of the sheets and compressed again, a convexo-concave 25
`structure may be formed at a rear surface 502 of the soft
`magnetic layer due to a mechanical pressure difference as
`shown in FIG. 8. This may induce reducing of guiding of the
`magnetic field.
`Further, the groove portion formed on a boundary surface 30
`between the sheets and the receiving coil is thermally
`hardened in the process of compressing at a high tempera(cid:173)
`ture, and therefore stable implementation is possible.
`Further, the polymer resin included in the sheets becomes
`an insulating material having high thermal stability through 35
`compression at a high temperature, and therefore the poly(cid:173)
`mer resin can perform an insulating function required
`between soft magnetic metal powders, and can prevent
`corrosion of the soft magnetic metal powders even at sev